In the chase scene in the beginning with the boats, when they reach the millenium dome and are going right at each other James turns on his torpedoes and fires the top one first but in the next scene it shows him firing the top torpedoe again.

Quote Rotator:
"Check out the torpedotubes. One solid structure... The only way a torpedo could move from one tube to another is if somebody reloaded it into another tube..."
Sorry, we're talking about an organisation which builds cloaking cars and so forth. Back in the early days of hand guns, people assumed you couldn't build a gun which loaded a bullet into the firing chamber. We have them now, it's called an automatic. Called so because from a clip of ammunition, it automatically loads a bullet to be fired. It's quite probable that Q and the rest of his men were able to construct a similiar device, only on a much larger scale to fit inside the boat.